Riftbound Legion
None of the 17 cards with Legion print a reminder explaining it, so there is no official wording to quote here. Rather than guess at the rule, the cards themselves are below.
Which domains get it
Which sets print it
Every card with Legion
Most expensive first. Prices are Cardmarket EUR.
Darius - Hand of Noxus
Origins
EUR 325.00
Darius - Executioner
Spiritforged · 6 energy
EUR 245.00
Darius - Hand of Noxus
Origins
EUR 26.99
Darius - Executioner
Spiritforged · 6 energy
EUR 18.00
Darius, Hand of Noxus (Origins Release Event Promo)
Origins
EUR 9.90
Darius - Executioner
Origins · 6 energy
EUR 2.00
Darius - Executioner
Origins · 6 energy
EUR 1.95
Noxian Guillotine
Origins · 4 energy
EUR 1.95
Darius - Hand of Noxus
Origins
EUR 0.55
Vanguard Captain (Origins Nexus Night Promo)
Origins · 3 energy
EUR 0.17
Undying Legion
Unleashed · 3 energy
EUR 0.10
Noxus Hopeful
Origins · 4 energy
EUR 0.08
Trifarian Gloryseeker
Origins · 2 energy
EUR 0.05
Vanguard Captain
Origins · 3 energy
EUR 0.03
Dangerous Duo
Origins · 3 energy
EUR 0.02
Scrapyard Champion
Origins · 5 energy
EUR 0.02
Sun Disc
Origins · 2 energy
EUR 0.02